Several studies try to identify important properties of SO pages, users, etc. Others search for features of unusual questions such as unanswered, closed and deleted questions with the goal to model and predict such questions [1]}, [2]}.
Some researches try to find high-quality questions, answers and code snippets posted on SO to help users find high-quality elements efficiently [3]}, [4]}, [5]}. Moreover, they model such behaviors and help programmers produce high-quality posts [6]}, [7]}.
Finally, some studies have focused on modeling expert finding and routing questions to appropriate answerers [8]}.
